Programming using the R Matrix Package

In versions of the Matrix package up to (and including) 0.999375-30,
<determinant(CF) where CF has been
computing the determinant of A, whereas e.g., determinant(chol(A))
has always returned the determinant of the Cholesky factor of
A = RR' = L'L.
Of course, det(A) = det(L)^2 = det(R)^2, or equivalently
log(det(A)) = 2 * log(abs(det(L))) = 2 * log(abs(det(R))) which is
what determinant() computes with its default
setting logarithm = TRUE.

This behavior is changed for consistency reasons, from Matrix version
0.999375-31 on, notably the upcoming Matrix 1.0-0.
"Once per session" warnings are issued in version 0.999375-30
(before the change) and 0.999375-31 (after the change),
possibly also for a few further releases.

Those of you making use of determinant(Cholesky(.)) are
strongly advised to make their R code work correctly in older
and newer versions of Matrix with something like the following